Improvement in double-acting hollow-piston pumps



Unire@ STATES l PATENT erica..

FRANCIS A. CHASE, ORJORDAN, Nnw vonk.

IMPROVEMENT IN DOUBLE-ACTING HOLLOW-PISTON PUMPS.V

Specification forming part of Letters Patent No. L13,637, dated July2li, 1564.

To all whom t may concern-.-

Be it known that I, FRANCIS A. CHASE, of Jordan, county ot' Onondaga,and Stateot'New York, have invented a new and Improved Pump; and I dohereby declare that the following is a full, clear, andexact'description thereof, reference being hadl to the accompanyingdrawings, making a part of this specitication, in which- Figure l is avertical diametrical section through my pump. Fig.2 is a horizontalsection taken through the middle of the pump. Fig. 3 is a side View, apart ot' which is shown in section to expose the ports. Figs. 4 and 5represents the double-wing supply-valve and its seats.

Similar letters of reference indicate corresponding parts in the severalfigures.

This invention relates to certain improvements on that class of pumpshaving a hollow piston-rod, through which thewater is forced by thealternate reciprocating movements of the piston, as will be hereinafterdescribed.

To enable others skilled in the art to makel and use my invention, Iwill describe its construction and operation.

The main portion or body of the pump con-A sists of a cylinder, A,closed at its ends by.

means of heads B B', and having passages C G' formed on one side,through which latter the water enters the cylinder A. Theinduction-passages C C' are separated from each other by a centralpartition, a, between which and the transverse division of the 'port-boxD a double-wing supply-valve, E, is pivoted, as shown clearly in Figs. land 2.' The box D is constructed with two openings or ports, b b',through it, communicating with the respective induction-passages C C',and that portion of this box which lits within said passages is groundsmoothly in order to form seats for the valve E. This box DY isremovable-z'. c., it is secured in position over the entrance to thepassages C C' by means of screw-bolts c c, by the removal of which thebox D, together with the double-wing valve E, can be taken olf andinspected. The faces of the valve E form au obtuse angle to each other,and at this angle the pin e passes through the connectionfof the twowing's and pivots them between the lugs g g which project from thetransverse division of the box D, as clearly represented in Figs. 1, 4,and 1The ports b b', which coniln unicate with the ind notion-passages(l C', will be alternately opened and closed by the wings of the valveE, acting against their respective seats and working within theirrespective induction-passages,as will behereinafter further explained.

The piston-rod F, which is hollow, passes through the head B ofthepumpcylinder, and has a circular disk,'G, suitably secured on its end,as shown in Figs. l and 2. The diameter ofthis disk Gis somewhat lessthan that ofthe cylinder within which it works, and on the face of saiddisk are three or more projections, k k lc, which are tapped forreceiving screw-bolts jjj, that are used to secure a disk, G',corresponding in dia-meter to G, on the ends of said projections. Theopposite faces of the two disks G G' should be parallel to each other,and their edges should be beveled, as represented in Fig. 1, for thepurpose of receiving the beveled surfaces ot' a metallic ring-piston, J,which is introduced between the two connected plates in such manner thatwhen the d pump is in operation this beveled ring will alternately formand close a passage above or below said piston communicatingV with thehollow piston-rod F.

The ring J is constructed so as to work tightly within the cylinder A,and the disks G G', between which this ring works, should be sufcientlysmall to allow the water above and below them to rush between themandin-to the hollow piston-rod freely and unobstructedly at propertimes.

The operation of my pump is as follows: As the piston rises the waterflows in through the lower, front, or side chamber-passage, C, and fillsthe cylinder. As the piston decends the lower wing ofthe supply-ValveEcloses., asindicated in red lines, Fig. l, opening the port of the upperpassage, C', and allowing the water to iiow'in and lill said cylinderoutside of the piston-rod. Simultaneously with the inlinx of water intothe upper chamber-passage, O', the water that was lirst received intothe cylinder A escapes between the lower plate, G', and ring J throughthe piston to the hollow rod F. As the piston again rises the waterabove it escapes through the space made between the piston or ring J andthe upper disk, G, and rushes into the hollow rod F, as

before. Thus the operation continues, the waer continually passingthrough the piston and being supplied alternately from above and belowthesarne, keeping up a constant discharge through the pipe until themotion ceases.

It will be seen that the valves, by being connected to the piston in themanner described, do not obstruct the passage-Way of the water to thehollow rod, their narrow or small legs k lc affording a free passage tothe hollow rod and obviating the obstructionwhich is offered by acentral winged leg, as in other pumps of this particular character.

It will also be seen that the annular piston, by being beveled at topand bottom, in connection with the beveled disks or valves, enables meto secure a tight joint between the valves and the piston at suchperiods as may be necessary during the operation of the pump.

I am aware that a three-chambered cylinderl is not new per se or incombination with a pump-piston. Therefore I do not claim such as myinvention; but

What I do claim as my invention, and desire to secure by Letters Patent,is-

l. The arrangement consisting of the threechambered cylinder or case,hollow piston-rod, double-acting piston, and double-acting oscillatingsupply-valve, substantially in the man* ner and for the purposedescribed.

2. Connecting the piston-valves directly to the hollow pistoirrod bymeans of separated legs k k, substantially as described.

3. The doubled-beveled ring J, Working between two beveled disks, G G',applied to the piston-rod F, substantially as and for the purposesdescribed..

4. The combination of the metallic wing` valve E,'doubleaotingpiston-valve, ring-piston, and hollow piston-rod with a three-chan beredpump, substantially as described.

5. The detachable port-box D, valve E, and division a, in combinationwith side passages or ports, C C', constructed substantially as and forthe purposes described.

FRANCIS A. CHA SE.

lith esses:

A. D. FOSTER, PETER M. COLE.

